CN109203616B - Three-layer co-extrusion casting film and preparation method thereof - Google Patents
Three-layer co-extrusion casting film and preparation method thereof Download PDFInfo
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- CN109203616B CN109203616B CN201810759553.3A CN201810759553A CN109203616B CN 109203616 B CN109203616 B CN 109203616B CN 201810759553 A CN201810759553 A CN 201810759553A CN 109203616 B CN109203616 B CN 109203616B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/26—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/32—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/546—Flexural strength; Flexion stiffness
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a three-layer co-extrusion casting film and a preparation method thereof, wherein the three-layer co-extrusion casting film comprises a base layer, a core layer and a surface layer, and is characterized in that the raw material for preparing the base layer and the raw material for preparing the surface layer are the same and comprise the following steps: high density polyethylene, linear low density polyethylene, medium density polyethylene, metallocene linear low density polyethylene, and filler; the raw materials for preparing the core layer comprise: high density polyethylene, linear low density polyethylene, medium density polyethylene, metallocene linear low density polyethylene, ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer. The three-layer co-extrusion casting film prepared by the invention has the advantages of simple preparation process, high production efficiency, environmental protection, good isotropic performance and excellent mechanical performance.
Description
Technical Field
The invention relates to the field of layered materials, in particular to a three-layer co-extrusion casting film and a preparation method thereof.
Background
The production and preparation methods of plastic films comprise various methods such as blow molding, stretch forming, tape casting and the like, wherein the production technology for preparing the films by adopting the tape casting method has the outstanding characteristics of high production efficiency, wide product application range and the like, and is widely adopted at the present stage. The polyethylene film is a widely used packaging material, has the good characteristics of low price, excellent performance and the like, and is particularly suitable for being manufactured by adopting a tape casting method. Compared with a dry composite membrane method, the polyethylene film prepared by adopting the tape casting method has the advantages of less production process, low energy consumption and low cost, the product has better and more stable structural quality, in addition, no three wastes are generated in the production process, the surrounding environment is not polluted, the requirement of environmental protection is met, the polyethylene film can be widely applied to packaging of foods, daily chemical products, medicines, decorative products and the like, and the polyethylene film has obvious market value and prospect.
Chinese patent CN201210592170.4 discloses a preparation method of a polyethylene cast film, which comprises the following steps: uniformly dispersing a nucleating agent in an organic solvent, and then uniformly mixing polyethylene particles; evaporating the obtained mixture under vacuum or normal pressure to remove the organic solvent; crystallizing polyethylene particles; and extruding and casting the crystallized polyethylene particles to form a film, and preparing the polyethylene casting film. However, the organic solvent adopted in the patent is easy to reduce the performance of the film, and increases the toxicity in the production process, which is not favorable for environmental protection.
Therefore, it is necessary to invent a casting film with excellent performance and convenient production and processing, so as to further improve the product performance of the packaging film.
Disclosure of Invention
Aiming at the problems, the invention provides a three-layer co-extrusion casting film and a preparation process thereof.
The technical scheme adopted by the invention for solving the problems is as follows: the three-layer co-extrusion casting film comprises a base layer, a core layer and a surface layer, wherein the raw material for preparing the base layer is the same as the raw material for preparing the surface layer, and the three-layer co-extrusion casting film comprises the following components in parts by weight: 25 to 35 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 15 to 25 parts of medium-density polyethylene, 10 to 20 parts of metallocene linear low-density polyethylene and 5 to 15 parts of filler; the core layer is prepared from the following raw materials in parts by weight: 25 to 35 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 15 to 25 parts of medium-density polyethylene, 10 to 20 parts of metallocene linear low-density polyethylene, 5 to 15 parts of ethylene-vinyl alcohol copolymer and 3 to 8 parts of ethylene-vinyl acetate copolymer.
Further, the filler is: any one or more of talcum powder, gypsum powder, white carbon powder, heavy calcium powder, kaolin, quartz powder and borax powder.
Another object of the present invention is to provide a method for preparing the three-layer co-extrusion casting film, which comprises the following steps:
step S01, respectively putting the raw materials for preparing the surface layer, the base layer and the core layer in parts by weight into hoppers of an extruder I, an extruder II and an extruder III, and starting a heating device to preheat the die and the extruder for 30-60 min;
and step S02, after the process temperature is reached, co-casting and extruding the obtained melt through a T-shaped die opening of an extruder under the action of pressure, draining the melt onto a cooling roller through a traction roller, rapidly quenching the melt, simultaneously performing auxiliary cooling and compaction through an air knife to form a surface-smooth film, monitoring the thickness of the film in real time through an infrared film thickness gauge, performing high-voltage electric shock treatment on the surface layer through a corona device to form a corona layer, cutting corners and removing edges, forming a coiled material through the traction action of a winding roller, and packaging to obtain the three-layer co-extrusion casting film.
Wherein the preheating temperature is 110-120 ℃.
Further, in step S02, the process temperature is 185 ℃ to 190 ℃.
Further, step S02 includes a step of performing a printing operation on the surface of the formed corona layer.
Further, in step S02, the flatness error of the planarized film is not more than ± 0.05%.
Further, in step S02, the traction force of the wind-up roll is 20N/m2～40N/m2。
Further, in step S02, the thickness of the three-layer co-extruded casting film is: 5-50 μm.
The invention has the advantages that:
1. the three-layer co-extrusion casting film is prepared by a casting method, the preparation process is simple and convenient, the production efficiency is high, toxic and harmful solvents are not used in the production process, the product performance is stable, and the environmental protection requirement is met;
2. the three-layer co-extrusion casting film prepared by the invention has good isotropic property, moderate crystallinity, good flexibility, outstanding anti-stretching capability, no wrinkling, no bur, bending resistance and anti-curling;
3. the three-layer co-extrusion casting film prepared by the invention has good processing performance, can be repeatedly heated and shaped, can be repeatedly printed, and can keep stable and invariable structure within a wide temperature range.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.
Example 1
The three-layer co-extrusion casting film comprises a base layer, a core layer and a surface layer, wherein the raw material for preparing the base layer is the same as the raw material for preparing the surface layer, and the three-layer co-extrusion casting film comprises the following components in parts by weight: 25 parts of high-density polyethylene, 15 parts of linear low-density polyethylene, 15 parts of medium-density polyethylene, 10 parts of metallocene linear low-density polyethylene and 5 parts of heavy calcium powder; the core layer is prepared from the following raw materials in parts by weight: 25 parts of high-density polyethylene, 15 parts of linear low-density polyethylene, 15 parts of medium-density polyethylene, 10 parts of metallocene linear low-density polyethylene, 5 parts of ethylene-vinyl alcohol copolymer and 3 parts of ethylene-vinyl acetate copolymer.
The preparation method of the three-layer co-extrusion casting film comprises the following steps:
step S01, respectively putting the raw materials for preparing the surface layer, the base layer and the core layer in parts by weight into hoppers of an extruder I, an extruder II and an extruder III, and starting a heating device to preheat the die and the extruder for 30 min; the preheating temperature is 110 ℃;
step S02, after the process temperature is reached, co-casting and extruding the obtained melt through a T-shaped die opening of an extruder under the action of pressure, draining the melt onto a cooling roller through a traction roller, rapidly quenching the melt, simultaneously performing auxiliary cooling and compaction through an air knife to form a surface-smooth film, monitoring the thickness of the film in real time through an infrared film thickness gauge, performing high-voltage electric shock treatment on a surface layer through a corona device to form a corona layer, cutting corners and removing edges, forming a coiled material through the traction action of a winding roller, and packaging to obtain the three-layer co-extrusion casting film; wherein the process temperature is 185 ℃; the method also comprises the step of printing on the surface of the formed corona layer; the flatness error of the flat film is not more than +/-0.05%; the traction force of the winding roller is 20N/m2(ii) a The thickness of the three-layer co-extrusion casting film is as follows: 5 μm.
Example 2
The three-layer co-extrusion casting film comprises a base layer, a core layer and a surface layer, wherein the raw material for preparing the base layer is the same as the raw material for preparing the surface layer, and the three-layer co-extrusion casting film comprises the following components in parts by weight: 35 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 25 parts of medium-density polyethylene, 20 parts of metallocene linear low-density polyethylene and 15 parts of filler; the core layer is prepared from the following raw materials in parts by weight: 35 parts of high-density polyethylene, 30 parts of linear low-density polyethylene, 25 parts of medium-density polyethylene, 20 parts of metallocene linear low-density polyethylene, 15 parts of ethylene-vinyl alcohol copolymer and 8 parts of ethylene-vinyl acetate copolymer.
The filler is: kaolin, quartz powder and borax powder.
The preparation method of the three-layer co-extrusion casting film comprises the following steps:
step S01, respectively putting the raw materials for preparing the surface layer, the base layer and the core layer in parts by weight into hoppers of an extruder I, an extruder II and an extruder III, and starting a heating device to preheat the die and the extruder for 60 min; the preheating temperature is 120 ℃;
step S02, after the process temperature is reached, co-casting and extruding the obtained melt through a T-shaped die opening of an extruder under the action of pressure, draining the melt onto a cooling roller through a traction roller, rapidly quenching the melt, simultaneously performing auxiliary cooling and compaction through an air knife to form a surface-smooth film, monitoring the thickness of the film in real time through an infrared film thickness gauge, performing high-voltage electric shock treatment on a surface layer through a corona device to form a corona layer, cutting corners and removing edges, forming a coiled material through the traction action of a winding roller, and packaging to obtain the three-layer co-extrusion casting film; wherein the process temperature is 190 ℃; the method also comprises the step of printing on the surface of the formed corona layer; the flatness error of the flat film is not more than +/-0.05%; the traction force of the winding roller is 40N/m2(ii) a The thickness of the three-layer co-extrusion casting film is as follows: 50 μm.
Example 3
The three-layer co-extrusion casting film comprises a base layer, a core layer and a surface layer, wherein the raw material for preparing the base layer is the same as the raw material for preparing the surface layer, and the three-layer co-extrusion casting film comprises the following components in parts by weight: 30 parts of high-density polyethylene, 22 parts of linear low-density polyethylene, 20 parts of medium-density polyethylene, 15 parts of metallocene linear low-density polyethylene and 10 parts of filler; the core layer is prepared from the following raw materials in parts by weight: 32 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 18 parts of medium-density polyethylene, 15 parts of metallocene linear low-density polyethylene, 9 parts of ethylene-vinyl alcohol copolymer and 7 parts of ethylene-vinyl acetate copolymer.
The filler is: gypsum powder, calcium carbonate powder and white carbon powder;
the preparation method of the three-layer co-extrusion casting film comprises the following steps:
step S01, respectively putting the raw materials for preparing the surface layer, the base layer and the core layer in parts by weight into hoppers of an extruder I, an extruder II and an extruder III, and starting a heating device to preheat the die and the extruder for 45 min; the preheating temperature is 115 ℃;
step S02, after the process temperature is reached, co-casting and extruding the obtained melt through a T-shaped die opening of an extruder under the action of pressure, draining the melt onto a cooling roller through a traction roller, rapidly quenching the melt, simultaneously performing auxiliary cooling and compaction through an air knife to form a surface-smooth film, monitoring the thickness of the film in real time through an infrared film thickness gauge, performing high-voltage electric shock treatment on a surface layer through a corona device to form a corona layer, cutting corners and removing edges, forming a coiled material through the traction action of a winding roller, and packaging to obtain the three-layer co-extrusion casting film; wherein the process temperature is 188 ℃; the method also comprises the step of printing on the surface of the formed corona layer; the flatness error of the flat film is not more than +/-0.05%; the traction force of the winding roller is 30N/m2(ii) a The thickness of the three-layer co-extrusion casting film is as follows: and 27 μm.
Example 4
The three-layer co-extrusion casting film comprises a base layer, a core layer and a surface layer, wherein the raw material for preparing the base layer is the same as the raw material for preparing the surface layer, and the three-layer co-extrusion casting film comprises the following components in parts by weight: 28 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 22 parts of medium-density polyethylene, 12 parts of metallocene linear low-density polyethylene and 8 parts of filler; the core layer is prepared from the following raw materials in parts by weight: 32 parts of high-density polyethylene, 28 parts of linear low-density polyethylene, 21 parts of medium-density polyethylene, 11 parts of metallocene linear low-density polyethylene, 8 parts of ethylene-vinyl alcohol copolymer and 6 parts of ethylene-vinyl acetate copolymer.
The filler is: talcum powder and heavy calcium powder;
the preparation method of the three-layer co-extrusion casting film comprises the following steps:
step S01, respectively putting the raw materials for preparing the surface layer, the base layer and the core layer in parts by weight into hoppers of an extruder I, an extruder II and an extruder III, and starting a heating device to preheat the die and the extruder for 50 min; the preheating temperature is 112 ℃;
step S02, after the process temperature is reached, co-casting and extruding the obtained melt through a T-shaped die opening of an extruder under the action of pressure, draining the melt onto a cooling roller through a traction roller, rapidly quenching the melt, simultaneously performing auxiliary cooling and compaction through an air knife to form a surface-smooth film, monitoring the thickness of the film in real time through an infrared film thickness gauge, performing high-voltage electric shock treatment on a surface layer through a corona device to form a corona layer, cutting corners and removing edges, forming a coiled material through the traction action of a winding roller, and packaging to obtain the three-layer co-extrusion casting film; wherein the process temperature is 189 ℃; the method also comprises the step of printing on the surface of the formed corona layer; the flatness error of the flat film is not more than +/-0.05%; the traction force of the winding roller is 35N/m2(ii) a The thickness of the three-layer co-extrusion casting film is as follows: 40 μm.
Examples of the experiments
The performance of the three-layer co-extruded cast films prepared in examples 1 to 4 was tested, and the test results are shown in table 1.
Table 1 results of performance test of three-layer coextruded cast films
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a three-layer is crowded curtain coating membrane altogether, includes basic unit, sandwich layer, top layer, its characterized in that, preparation the raw materials of basic unit is the same with the preparation the raw materials on top layer all include according to the part by weight: 25 to 35 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 15 to 25 parts of medium-density polyethylene, 10 to 20 parts of metallocene linear low-density polyethylene and 5 to 15 parts of filler; the core layer is prepared from the following raw materials in parts by weight: 25 to 35 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 15 to 25 parts of medium-density polyethylene, 10 to 20 parts of metallocene linear low-density polyethylene, 5 to 15 parts of ethylene-vinyl alcohol copolymer and 3 to 8 parts of ethylene-vinyl acetate copolymer; the filler is as follows: any one or more of talcum powder, gypsum powder, white carbon powder, heavy calcium powder, kaolin, quartz powder and borax powder.
2. A method of producing a three layer coextruded cast film according to claim 1, characterised in that it comprises the following steps:
step S01, respectively putting the raw materials for preparing the surface layer, the base layer and the core layer in parts by weight into hoppers of an extruder I, an extruder II and an extruder III, and starting a heating device to preheat the die and the extruder for 30-60 min;
and step S02, after the process temperature is reached, co-casting and extruding the obtained melt through a T-shaped die opening of an extruder under the action of pressure, draining the melt onto a cooling roller through a traction roller, rapidly quenching the melt, simultaneously performing auxiliary cooling and compaction through an air knife to form a surface-smooth film, monitoring the thickness of the film in real time through an infrared film thickness gauge, performing high-voltage electric shock treatment on the surface layer through a corona device to form a corona layer, cutting corners and removing edges, forming a coiled material through the traction action of a winding roller, and packaging to obtain the three-layer co-extrusion casting film.
3. The method according to claim 2, wherein the preheating temperature is 110 ℃ to 120 ℃ in step S01.
4. The method according to claim 2, wherein the process temperature is 185 ℃ to 190 ℃ in step S02.
5. The method of claim 2, wherein step S02 further comprises a step of printing on the surface of the corona layer.
6. The method according to claim 2, wherein in step S02, the flatness error of the flat film is not more than ± 0.05%.
7. The manufacturing method according to claim 2, wherein in step S02, the traction of the wind-up roll is 20N/m2～40N/m2。
8. The production method according to claim 2, wherein in step S02, the thickness of the three-layer co-extruded casting film is: 5-50 μm.
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| CN110370765A (en) * | 2019-08-09 | 2019-10-25 | 黄山永新股份有限公司 | A kind of resistance to boiling freeze-resistant curtain coating polyethylene film and its production method |
| CN114851660B (en) * | 2022-03-03 | 2024-03-26 | 上海紫华薄膜科技有限公司 | Breathable casting film and preparation method thereof |
| CN117400612B (en) * | 2023-12-15 | 2024-03-22 | 河南达新源新材料有限公司 | Low-density heat-shrinkable film for labels, preparation method and application thereof |
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